trash bin button needs to be an input field

This should also solve: #5082 

@DeepDiver1975 it looks like you changed this here https://github.com/owncloud/core/commit/4e751cbb473b416f693473ae69e7c55e013e854b#diff-c3ec1128ca1a7f2c27c715d05bd46a36L41 Any reasons why you changed the input to a div?